Enhanced expression of TS protein in NSCLC compared with the corresponding normal tissues. Paraffin sections from patients with NSCLC were prepared and stained with anti-TS antibody and then reviewed and scored under a microscope. A-C, Representative low, medium, and high levels of TS expression, respectively. D, Negative staining of normal tissues. E, strong expression of TS protein in lung squamous cell carcinoma. F, low level of TS expression in lung adenocarcinoma.